ASA: Extra Players, a batting Flex, and a skipped DP hitter

[teebob21]

How would you fix this situation? ASA invitational.

Team A bats 10 under the ASA Extra Player rule, and wants to also use the DP/Flex. The Flex is listed 3rd in the lineup, and the DP is listed playing a defensive position, and is in the 7th spot in the order. The plate umpire incorrectly accepts this lineup. (I was the base umpire, but was not present at the pregame meeting because I was changing from having the plate in the previous game.)

In the 1st inning, the Flex bats and grounds out. In the 2nd inning, the DP does not bat, and pitches are thrown to the 8th batter. In the 3rd inning, the 10th batter is due up first to come to the plate. Team B, on defense with a 2-2 count, appeals that Batter #10 is batting out of order.

What do you rule at this point?